Synthesis of heterocycles. Construction of the 1-azabicyclo[2.2.1]heptyl system by sequential ring-closure of acyclic β-ammonio substituted radicals
作者:Ernest W Della、Andrew M Knill
DOI:10.1016/0040-4039(96)01231-2
日期:1996.8
Treatment of an irradiated solution of 1-methyl-1-(2-propynyl)-1-bis(2-phenylselenylethyl)ammonium iodide in tert-amyl alcohol with tributyltin hydride is found to be an effective procedure for the synthesis of 1,4-dimethyl-1-azoniabicyclo-[2.2.1]heptaneiodide. Attachment of a trimethylsilyl or phenyl substituent to the terminal carbon of the triple bond in the alkynyl salt leads to bridgehead-substituted
Synthesis of Bridgehead Nitrogen Heterocycles via Cyclization of α-Ammonio 5-Hexenyl Radicals
作者:Ernest W. Della、Paul A. Smith
DOI:10.1021/jo9813538
日期:1999.3.1
bicyclic salts so obtained unexpectedly leads to rupture of one of the rings rather than loss of the N-methyl group. The 1-azabicyclo[2.2.1]heptane could be accessed readily via tin hydride-induced cyclization of the corresponding N-phenylethylammonium salt 54, followed by Hofmann elimination with potassium tert-butoxide.